Radio signaling apparatus



Nov. 23 1926.

A. H. TAYLOR ET AL RADIO SIGNALING APPARATUS Filed Jan.

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A. H. TAYLOR ET AL RADIO SIGNALING APPARATUS Filed Jan. '7, 1925 2 Sheets-Sheet 2 I flleri E Z aylor Zea 6'. Eur? Sm: new

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UNITED STATES PATENT OFFICE.

ALBERT H. TAYLOR AND Lao c. YOUNG, or WASHINGTON, DISTRICT or COLUMBIA,

ASSIGN OBS T WIRED RADIO, INQ, OF NEW YORK, N. Y., A. CORPORATION OF DELA- WARE.

RADIO SIGNALING ArrAnATos.

Application filed January}. 1925. Serial No- 1,055.

These improvements relate particularly td radio signaling apparatus and more particu larly to improvements in radiating systems thereof. f

The particular object of our invention is to provide an etficient radiating system for radio signaling apparatus where the radiating system leads are long and must be encased in insulators or suspended in metal H) trunks, or suspended. by insulating sub stances in the near vicinity of grounded metal.

Another object of our invention is to reduce the radiating losses when the leads to Hi the radiating system of radio signaling -ap-= paratus are encased or surrounded by grounded metal. A. further object of our invention is to provide a radiating system whose free period of oscillation of the antenna proper is uninfiuenced by the capacity eflfiect of the leads between the transmitter and the antenna proper.

A still further object of our invention is ,25 to improve the purity of the wave form of radiated oscillations when the'leads to the radiating system are'encased in metal. or surrounded in the near vicinity by metal.

With the above and other objects in view so the invention consists in the construction, combination and arrangement-of parts, as will be hereinafter more fully described.

Referenceis to be had to the accompanying drawings forming part of this specification, in which the like reference characters indicate corresponding parts throughout the several views, and in which k Figure 1 discloses the general embodimerit of the invention in which the various 4o circuits are coupled inductively.

Figure 2 represents a modification in which the coupling between the circuits is by means of auto-transformers.

partially illustrated; 2 represents the plate I'eed circuit; 3 representsa choke coil in the plate i'eed circuit; 4 represents a stopping condenser, and 5 represents the inductance tuning coil. This circuit is the usual power tube' arrangement, The inductance tuning coil 6, tuning condenser 7, antenna lead 14, and metal trunk 8, form a link circuit between the transmitter and. the radiating system proper. The antenna or radiating system proper comprises antenna '12, inductance coil 11, tuning capacity 10, and ground 13.

By inserting this intermediate circuit between the transmitter and the antenna proper, the tuning of the antenna, especially above the roof, the greater share of the lead.

to short Waves, is very much simplified, for,

' if the antennaleads are long and are suspended in hollow metal trunks, such as when the transmitter is on one of the lower floors ofla building with the antenna supported capacity of the radiating system is in the The ratio of the capacity of the leads to the capacity of the antenna proper is sometimes as high as four to one, which means that four fifths of the current output of the transmitter is expended in charging up the capacity of the leads to ground. While the actual power losses in watts may not be very great, still it-represents an additional load on the tube which is undesirable period of the antenna is so uncomfortably close to the frequency of the transmitter and the active portion of the radiatingsystem;

must be made so small that radiation will be very ineflicient and the radiated signals will Fi ure 3 represents a modification in a second intermediate circuit is disclosed, and

Figure 4 represents a modification using a combination of auto transformers and 1n 1 ductively coupled transformers with insertso ed indicating means.

be very weak. By means of this invention, however, the design of the antenna proper may be-such that its actual period is practically equal to the period of the radiated frequency, allowance being made for inductance for coupling only;

' The accompanying drawings show four methods of coupling the intermediate circuit or circuits between the power tubes and the antenna proper. However, this invention is not limited to a power tube transmitter or 'to the particular forms of coupling the link circuit as shown,

The tuning of the intermediate circuit is ac-- complished by varying condenser 7 and coils 6 and 9. The radiatin antenna proper is coupled to the interme iate circuit by coils 9'and 10 which functioneas a transformer. The tuning of the radiating circuit is accomplished by varying capacity 10 and induc the, coupling of the three circuits'is direct rather than inductive and thetuningof the antenna circuit is accomplished by varying the inductanceonly. Coils and 16 perform the function of tuning coils and may be considered auto transformers. Condenser 7 is included at the lower end of the antenna trunk lead-14 and is highly essential in the operation of the circuit, but it does not sharply tune the trunk line circuit. The variable condenser 7 in this case acts more V as a coupling condenser, feeding energy over to the coupling inductancel'fi.

Figure 3 shows a modified circuit arrangement in which a second intermediate circuit is provided, consisting of inductancecoils 17 1 and 18. and condenser 19; This circuit is added between the transmitter and the link circuit and gives a sharp tuning arrangement and has a beneficial effect upon the purity of the emitted wave.

Figure 4% shows a 'modification in which the auto-transformer and tuning arrange.

ment 15 isthe same as in igure 2. Condenser 10 may remain fixed over a wide range of wavelengths and tuning maybe accomplished by a variometer 20 operated by any remote control system such as a motor controlled through shielded leads from the transmitting room, the motor being properly geared to the shaft of the variometer. A thermo couple 21 is inserted at the base of the antenna proper and may be connectedthrgugh shielded leads to an inpre end only the general andpreferredeme dicating ammeter in the'transmitting room. 7 It willbe understood that the above descri tion and accompanying drawings combodiment of our invention andthatlvarious minor changes. in details of construction, proportion and arrangement of parts may be made within the scope of the appended claims without sacrificing any of the advantages of our invention;

What we claim'is: I

frequency oscillation circuit, a high fro quency radiation system located at a distance from said high frequency oscillation circuit, an auto-transformerinductance system connected in said oscillation circuit and midpoints of said auto-transformer 'induc- 1 tance systems and to ground for suppressing the radiation of energy intermediate said oscillation circuit and said radiation system; 2. In a radio transmission system a high frequency oscillation circuit, a high 7 frequency radiation system located at a distance from said high frequency oscillation circuit,

an auto-transformer inductance system connected in said oscillation circuit and in said radiation system, each of said transformer systems including a pair of windings connected at adjacent ends, a lead, includin a series connected, adjustable capacity isposed between one winding of each of said transformer systems, and a metallic trunk surrounding said lead and connected-with the adjacent ends of each of said air of v windings and to ground, for permitting the transfer of high frequency energy from said high frequency oscillation circuit to said radiation system, while suppressing; radiation intermediate said oscillation circuit and said radiation system. 1 j

;3. In a radio transmission system a high frequency oscillation circuit, a high frequency radiationsystem located at a distance from said high frequency oscillation circuit, an auto-transformer inductance system connected in said oscillation circuit and in said radiation system, each of said transformer systems including a'pair of windings connected at adjacent ends, a tuned circuit connected with one winding of one of said transformer systems, anextended conductor connected with one winding of'the other of said transformer systems and including a tuned circuit in series therewith and in (mm pled-relationship with said first mentioned tuned circuit a,metallic trunk surroundin saidw extended conductor and connected wit the adjacent ends of each of said pair of windings, and connections between said second mentioned tuned circuit, said metallic ,trunk and ground, whereby the transfer of high frequency energy from said high freq iencyv oscillation circuit to said radiation system may be efl'ected while suppressing ra- "diation intermediate said oscillation circuit and said radiation system.

4. In a radio transmission system a high \fi equency oscillation circuit, a high .fre-

uency radiation system located at a distance roin said high frequency oscillation circuit, 1. In a radio transinission'systein a high.

radiation system, each of said transformer systi'a nsincluding a pair of windings connected'at adjacent ends, a tuned circuit connected with one winding of the auto-transformer inductance system in said high freauency oscillation circuit, an extended conuctor connected with one winding of said auto-transformer inductance system in said radiation system, said conductor including a tuned circuit in series therewith, and in coupled relationship with said first mentioned tuned circuit, a metallic trunk surrounding said extended conductor and connected with 10 the adjacent ends of each of said pair of windings, and connections between said, sec

ond mentioned tuned circuit, said metallic trunk and ground, whereby the transfer of 

